Investigation of the Release Mechanism and Mould Resistance of Citral-Loaded Bamboo Strips

Abstract

In the present study, the sustained-release system loading citral was synthesised by using PNIPAm nanohydrogel as a carrier and analysed its drug-release kinetics and mechanism. Four release models, namely zero-order, first-order, Higuchi, and Peppas, were employed to fit the experimental data, and the underlying action mechanism was analysed. The optimised system was applied to treat a bamboo mould, followed by assessment of the mould-proof performance. Our experimental results revealed that the release kinetics equation of the system conformed to the first order; the higher the external temperature, the better the match was. In the release process, PNIPAm demonstrated a good protection and sustained-release effect on citral. Under the pressure of 0.5 MPa, immersion time of 120 min, and the system concentration ratio of 1, the optimal drug-loading parameters were obtained using the slow-release system with the best release parameters. Compared to the other conditions, bamboos treated with pressure impregnation demonstrated a better control effect on bamboo mould, while the control effect on Penicillium citrinum, Trichoderma viride, Aspergillus niger, and mixed mould was 100% after 28 days. Moreover, the structure and colour of bamboo remained unchanged during the entire process of mould control.

A MOF-based pH-responsive dual controlled-release system for herbicide pretilachlor and safener AD-67 delivery that enhances the herbicidal efficacy and reduces side effects

“…The fitting models were a zero-order equation, first-order equation, Higuchi equation, and Peppas equation. 45 It can be seen from Table 1 that at pH = 5.8, the fitting correlation coefficients R 2 of the Pre-release curve with the zero-order, first-order, Higuchi, and Peppas kinetic models were 0.975, 0.052, −8.840, and 0.786, respectively. At pH = 6.5, the fitting correlation coefficients R 2 between the release curve of Pre and the four kinetic equations were 0.899, 0.927, 0.963, and 0.966, respectively.…”